StackOverflow2013

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plurals

POI have got a nullpointer exception
primarykey
Id
18400353
data
AcceptedAnswerId
0
AnswerCount
2
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2013-08-23T10:18:55.523
FavoriteCount
0
LastActivityDate
2013-08-23T10:31:17.623
LastEditDate
2013-08-23T10:28:39.647
LastEditorUserId
2069044
OwnerUserId
2656455
ParentId
0
PostTypeId
1
Score
-1
ViewCount
66
LastEditorDisplayName
text
Body
hi i have created an application in android but on running I am getting a null pointer exception I am giving my log cat and java class below I need a better solution to overcome this error <pre><code>08-23 10:09:57.426: E/AndroidRuntime(3373): FATAL EXCEPTION: main 08-23 10:09:57.426: E/AndroidRuntime(3373): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.neochat/com.neochat.Friends_list}:java.lang.NullPointerException 08-23 10:09:57.426: E/AndroidRuntime(3373):at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 08-23 10:09:57.426: E/AndroidRuntime(3373): at android.app.ActivityThread.startActivityNow(ActivityThread.java:2023) 08-23 10:09:57.426: E/AndroidRuntime(3373): at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135)` </code></pre> Here is my java class <pre><code> public class Friends_list extends Activity implements OnItemClickListener{ private ArrayList<String> results = new ArrayList<String>(); private SQLiteDatabase newDB; LoginDataBaseAdapter loginDataBaseAdapter ; ListView listview; Context context; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.activity_friends); listview=(ListView)findViewById(R.id.listview); context=this; loginDataBaseAdapter.getfriends(); public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { Intent in2=new Intent(Friends_list.this,InboxActivity.class); startActivity(in2); } } </code></pre> I am giving my getFriends() function below <pre><code> public List<String>getfriends(){ List<String> FriendList=new ArrayList<String>(); String selectQuery="select * from UserDetails"; db=dbHelper.getWritableDatabase(); Cursor cursor=db.rawQuery(selectQuery, null); while(cursor.moveToNext()){ FriendList.add(cursor.getString(1)); } return FriendList; } </code></pre> I want to display the contents of the table in the database to a listview in my activity can anybody help me
Tags
<android><sqlite><listview>
Title
I have got a nullpointer exception
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USDivya Motiwala
UserOwnerUserId
1. USuser2656455
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POI have got a nullpointer exception
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTApproveEditSuggestion
2. VO
 singulars
 PostPostId
 POI have got a nullpointer exception
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTDownMod
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.